Connection to the database in WPF with MVVM design pattern

Good evening,
I am a beginner at MVVM design patter and WPF I am trying to make a small example of connection to the MS Access database using the WPF and MVVM Light Toolkit patter design. here is the code I insert for the connection:

Model / DataConnection.cs

public class DataConnection
{
public void OpenConnection()
{
OleDbConnection con = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=db.accdb;" +
"Persist Security Info=False;");
OleDbCommand cmd = con.CreateCommand();
cmd.CommandText = "Insert into table (num,nom)Values(123,'nom1')";
cmd.Connection = con;
con.Open();
cmd.ExecuteNonQuery();
MessageBox.Show("Record Submitted", "Congrats");
}
}

ViewModel / MainViewModel.cs

public class MainViewModel : ViewModelBase
{
private DataConnection _dataconnection;
public MainViewModel(DataConnection dataconnexion)
{
_dataconnection = dataconnexion;
_dataconnection.OpenConnection();
}
}

ViewModel / ViewModelLocator.cs

public class ViewModelLocator
{
static ViewModelLocator()
{
ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
SimpleIoc.Default.Register();
SimpleIoc.Default.Register();
}
public MainViewModel Main
{
get
{
return ServiceLocator.Current.GetInstance();
}
}
///
/// Cleans up all the resources.
///
public static void Cleanup()
{
}
}

when i run the program it does not do anything and when i debug i find that the instruction stops at the instruction level

con.Open();

model / DataConnection.cs file and then it goes to MainWindow.xaml.cs.
I do not find why he does not continue the execution of all the instructions?